Tensioning device for the warp



J 1952 c. CHRISTIANSEN ET AL 2,603,240

TENSIONING DEVICE FOR THE WARP THREADS IN CIRCULAR LOOMS Filed July 13, 1948 aw/mm Patented July 15, 1952 FFICE TENSIONIN G DEVICE FOR THE WARP THREADS IN CIRCULAR LOOMS Christian Christiansen, Lille Froen, and Gustav Otto Karl Riisch, Manda], Norway Application July 13, 1948, Serial No. 38,358 In Norway July 15, 1947 1 Claim.

This invention relates to circular looms for the Weaving of hoses of hemp or the like.

In such circular looms it is important, in order to ensure that the hoses hold tight at high pressures to keep both the weft threads and the Warp threads very taut so as to obtain a tight texture. In circular looms as used up till now the warp threads are each loaded with a weight suspended on the thread between two guide rods situated between the bobbins and the loom heddles. These weights have to be rather heavy and the thread consequently is subjected to a very great stress, which is further increased by the kinetic energy of the weight by the falling of the same during the backward movement of the thread at the closing of the lease. Breakage of the warp threads therefore easily occurs.

The object of the present invention is to provide a device for tensioning the warp threads, by means of which device the said draw-back is eliminated, since the threads can be kept sufliciently taut and the tightening can be adjusted also when a very light Weight is used.

According to the invention the device comprises at least two parallel rods over which the warp threads are passed in S-form and which are fastened in a pivotably mounted support, so that the position of the line between the centres of the rods and thereby the portion or arc of the circumference of the rods over which the threads slide may be adjusted. The tensioning device suitably may be located between the warp thread bobbins and the place in which the tensioning weights are suspended on the warp threads. The rods may have diiferent lengths, so that each device can serve for checking of a greater or smaller number of threads, and the rods contingently may be provided with periphera1 grooves for guiding of the threads.

The drawing illustrates diagrammatically an embodiment of a tensioning device according to the invention.

In the drawing, I is the weaving ring or caliber at the upper edge of Which the weaving is effected, and 2 the woven hose which by the weaving is gradually pulled down through the weaving ring and the pipe 3 carrying the same. 4 is the weft thread bobbin, 5 the sector carrier and 6 the sector pressing the weft thread in between the warp threads.

The warp threads which are indicated by 1 and 1' are passed from the bobbins 8, 8' through 2 the guides 9, over the guide rods 19, H and from here through known heddles l4, [4 to the weaving ring I. I5 is the tensioning weight which is suspended in a bight of the warp thread between the guide rods I0 and II.

In the embodiment shown the tensioning device is located between the bobbins 8, 8 and the guides 9. The device comprises the rods [6 and H which in each end are fastened in a support 18 which is rotatably mounted about pivot 19 as indicated with dotted lines. The warp threads are passed in S-form around the rods [6 and i1. Contingently the threads may be passed over a guide rod 20 between the bobbins and the tensioning device so that the warp threads are passed approximately vertically between the bobbins and the said guide rod.

We claim:

In a circular loom of the kind in which the weaving is carried out at the upper edge of a weaving ring, a tensioning weight suspended in a bight of each warp thread between two thread guides, and an additional warp thread tensioning device provided for operation in conjunction with the said weight, the said additional device being located between the warp thread supply and the said weight and comprising a pair of parallel rods over which the warp threads are passed in zig-zag form, said rods being mounted in a support pivotably mounted on an axis parallel to the axes of the said two rods.

CHRISTIAN CHRISTIANSEN.

GUSTAV o'r'ro KARL Rt'iscH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,544,320 Hough June 30, 1925 2,417,204 Lanz Mar. 11, 1947 2,442,796 Young June 8, 1948 2,450,183 Christiansen Sept. 28, 1948 2,460,512 Lanz Feb. 1, 1949 2,475,059 Skeer et a1. July 5, 1949 FOREIGN PATENTS Number s Country Date 221,282 Switzerland Aug. 17, 1942 232,727 Great Britain Apr. 30, 1925 628,795 France July 5, 1927 

